K–Ca dating Wikipedia ~ Where λ is the decay constant t 12 is the halflife N 0 is the initial concentration of the parent isotope and N is the final concentration of the parent isotope Similarly the equation for the decay time of a radioactive nucleus that decays to more than one product is

Rate equation Wikipedia ~ The rate law or rate equation for a chemical reaction is an equation that links the reaction rate with the concentrations or pressures of the reactants and constant parameters normally rate coefficients and partial reaction orders For many reactions the rate is given by a power law such as where A and B express the concentration of the species A and B usually in moles per liter

Navy and Marine Corps Aircraft Tail Codes ~ Tail codes on the Navy aircraft are the markings that help to identify the aircrafts unit andor base assignment These codes comprise one or two letters or digits painted on both sides of the vertical stabilizer on the top right and on the bottom left wings near the tip

Exponential function Wikipedia ~ where b is a positive real number and in which the argument x occurs as an exponent For real numbers c and d a function of the form is also an exponential function as it can be rewritten as As functions of a real variable exponential functions are uniquely characterized by the fact that the growth rate of such a function that is its derivative is directly proportional to

Chemical equilibrium Wikipedia ~ In a chemical reaction chemical equilibrium is the state in which both reactants and products are present in concentrations which have no further tendency to change with time so that there is no observable change in the properties of the system Usually this state results when the forward reaction proceeds at the same rate as the reverse reaction

Cai Lun Wikipedia ~ Cai Lun tsʰâi lwə̌n Chinese 蔡伦 CE 48–121 courtesy name Jingzhong 敬仲 was a Chinese eunuch inventor and politician of the Han is traditionally regarded as the inventor of paper and the papermaking process in forms recognizable in modern times as paper as opposed to papyrusAlthough early forms of paper had existed in China since the 2nd century BCE he

Saturated calomel electrode Wikipedia ~ The saturated calomel electrode SCE is a reference electrode based on the reaction between elemental mercury and mercuryI has been widely replaced by the silver chloride electrode however the calomel electrode has a reputation of being more aqueous phase in contact with the mercury and the mercuryI chloride Hg 2 Cl 2 calomel is a saturated solution of

Pourbaix diagram Wikipedia ~ Pourbaix diagram for water including equilibrium regions for water oxygen and hydrogen at STP The vertical scale is the electrode potential of a hydrogen or noninteracting electrode relative to an SHE electrode the horizontal scale is the pH of the electrolyte otherwise noninteracting Assuming no overpotential above the top line the equilibrium condition is oxygen gas and oxygen

Equilibrium constant Wikipedia ~ where R is the universal gas constant T is the absolute temperature in kelvins and ln is a natural logarithm This expression implies that ⊖ must be a pure number and cannot have a dimension since logarithms can only be taken of pure numbers must also be a pure number

Kinetic isotope effect Wikipedia ~ In physical organic chemistry a kinetic isotope effect KIE is the change in the reaction rate of a chemical reaction when one of the atoms in the reactants is replaced by one of its isotopes Formally it is the ratio of rate constants for the reactions involving the light k L and the heavy k H isotopically substituted reactants isotopologues